QMT SF6-free medium-voltage switchgear
Air insulation, no SF6
Vacuum circuit breaker
Compartments accessible from the front
750 mm wide
Air-insulated secondary distribution up to 24 kV, in two families: modular or monobloc. No fluorinated gas over the life cycle of the plant, in line with EU Regulation 2024/573. The switchgear enters CEP substations already installed, wired and tested.
MV units and switchgear
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Modular switchgear · ABB UniSec Air
ABB SDC AIR ·
Line incomer or feeder
Product page
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Modular switchgear · ABB UniSec Air
ABB SFC AIR ·
Transformer protection
Product page
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Modular switchgear · ABB UniSec Air
ABB SBC AIR ·
Incomer or feeder with vacuum circuit breaker
Product page
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Modular switchgear · ABB UniSec Air
ABB SBR AIR ·
Reversed line incomer
Product page
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Monobloc switchgear · Eaton Xiria 630 Block Type
EATON XIRIA 630 RV ·
Busbar riser and circuit breaker
Product page
Modular or monobloc?
Modular switchgear
 ABB UniSec Air component
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Monobloc switchgear
 Eaton Xiria 630 Block Type component
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| When to choose it | Complex diagram or a plant that will grow | Typical diagram, fixed footprint | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Units | 10 functional units, to be placed side by side | 5 configurations of two or three units | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Height | 1700 / 2000 mm | 1725 mm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Width | 375 · 500 · 750 mm | 760 · 1110 mm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Extendable | Yes, without redoing the layout | No, sealed enclosure | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full list |
See the ten units
Underlined designations have a product page. |
See the five configurations
Underlined designations have a product page. |
Air-insulated secondary distribution up to 24 kV, with no fluorinated gas. Selected, integrated and tested in the plant together with the transformer and the LV switchboard: the substation arrives on site ready for commissioning.
The switchboard in numbers
- Rated voltage
- 24kV
- Rated busbar current
- 630A
- Rated short-time withstand current · 1 s
- 16kA
- Lightning impulse withstand voltage
- 125kV
- Functional units of the modular line
- 10units
1 point is CO2.
Everything else is SF6.
Sulphur hexafluoride, SF6, is the gas that for decades has insulated live parts inside medium-voltage switchgear. It insulates well and allows compact switchgear. It has, however, a global warming potential about 24,000 times that of CO2, which is why EU Regulation 2024/573 is phasing it out of medium-voltage equipment.
Air-insulated switchgear contains no SF6. In day-to-day operation this means no pressures to monitor, no refills, no greenhouse gas to track and to dispose of as special waste at end of life.
F-gas Regulation
A plant without SF6 will not need upgrading when the European restrictions on fluorinated gases come fully into force.
Data common to both families
Electrical characteristics
- Rated voltage
- 24 kV
- Lightning impulse withstand voltage
- 125 kV
- Power-frequency withstand voltage
- 50 kV · 1 min
- Rated frequency
- 50 Hz
- Rated busbar current
- 630 A
- Short-time withstand current
- 16 kA / 1 s
- Peak withstand current
- 40 kA
Safety and insulation
- Internal arc withstand
- IAC AFLR 16 kA / 1 s
- Degree of protection
- IP3X
- Insulation
- air · no fluorinated gas
Reference standards
- IEC 62271-1
- -100
- -102
- -103
- -105
- -106
- -200
- -304
- CEI 0-16
- UE 2024/573
Loss of service continuity · modular line
- LSC1
- LSC2
- LSC2A
- LSC2B
Compartmentation · modular line
- PI
- PM
UniSec Air enclosure height · mm
- 1700
- 2000
Integrated in the substation
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Selection
The MV switchgear is a selected component of the substation, like the transformer.
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Integration
Installed and wired in the plant, inside the CEP substation.
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Testing
Tested together with the transformer and the LV switchboard.
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On site
The substation arrives ready for commissioning.
Contact us!
For information about an MV switchgear or its integration in a substation, please send us the network diagram if you have it and the units you need.